Las Vegas Hilton Fire

I have found several sources stating that the 1981 Las Vegas Hilton fire was a result of arson. Who was the arsonist, and what was the arsonist’s motive?

I found this page that says it was a busboy (it’s the first item under February 12). No name though.

ISTR that there was some kind of labor dispute at the time; that may have provided a motive.